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Catalyst for Olefin Polymerization and Polymerization Method Using the Same

a technology of olefin polymerization and catalyst, which is applied in the field of catalyst for olefin polymerization, can solve the problems of not having satisfactory performance in view of polymerization activity and stereoregularity, method also not having satisfactory performance in view of hydrogen response and stereoregularity upon polymerization, etc., to achieve high stereoregularity, low cost, and high fluidity

Inactive Publication Date: 2008-11-27
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]It is an object of the present invention to provide a catalyst for olefin polymerization, for preparing an olefinic polymer with high stereoregularity and high fluidity, at a low cost, with a high activity, and without use of a chain transfer agent such as hydrogen molecules in a large amount, which comprises a titanium-based solid component, an organometallic compound, and an organosilicon compound; and a method for polymerizing an olefin using the catalyst.
[0019]Among the block polypropylenes simultaneously satisfying the aforementioned requirements [a′] to [c′], a block polypropylene simultaneously satisfying the requirements [a] to [c] is a novel block polypropylene which can be produced using the catalyst for olefin polymerization of the present invention for the first time, while greatly contributing to the industry:

Problems solved by technology

However, specifically exemplified compounds therein are only dimethoxysilanes, which do not have satisfactory performances in view of the polymerization activity and stereoregularity.
JP-A No. 8-143620 discloses a method for polymerizing an α-olefin using a dialkoxysilane having two aliphatic amino substituents, but this method also does not have satisfactory performances in view of hydrogen-response and stereoregularity.
In addition, JP-A Nos. 8-143621 and 11-147923 disclose methods for polymerizing an α-olefin using an organosilicon compound having a cyclic amino group, but these methods is also does not have satisfactory performances in view of hydrogen-response upon polymerization.
However, the catalysts for an olefin polymer as disclosed above are still insufficient in improvement on stereoregularity and hydrogen-response.
If the polymerization catalysts are insufficient in hydrogen-response, in the case of preparing an olefin polymer having high stereoregularity and low molecular weight (high fluidity) with liquefied monomers (so-called, bulk polymerization), use of an excessive amount of hydrogen molecules as a chain transfer agent in a polymerization reactor have caused problems in the polymerization reactor having a limit in the internal pressure.
If the polymerization temperature is lowered so as to decrease the pressure, the production rate is inevitably delayed, thereby generating a problem of giving adverse effect on the productivity.

Method used

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  • Catalyst for Olefin Polymerization and Polymerization Method Using the Same
  • Catalyst for Olefin Polymerization and Polymerization Method Using the Same
  • Catalyst for Olefin Polymerization and Polymerization Method Using the Same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[1] Preparation of Solid Titanium Catalyst Component

[0158][1-i] Preparation of Solid Component

[0159]A high-speed mixer with an internal volume of 2 liter (manufactured by Tokushu Kika Kogyo K. K.) was thoroughly purged with nitrogen gas, and 700 ml of purified kerosine, 10 g of commercial available magnesium chloride, 24.2 g of ethanol and 3 g of Emasol 320 (sorbitan distearate, a product of Kao-Atlas K. K.) were placed therein. While stirring the mixture, the temperature thereof was elevated and the mixture was stirred at 120° C. and 800 rpm for 30 minutes. Under the high-speed stirring, the resulting solution was transferred to a 2-liter glass flask (equipped with a stirrer) which was previously charged with 1 liter of purified kerosine cooled to −10° C. by using a Teflon (registered trademark) tube having an inner diameter of 5 mm. The resulting solid was collected by filtration and thoroughly washed with purified n-hexane to obtain a solid adduct in which ethanol coordinated to ...

example 2

[0166]The polymerization was carried out in the same manner as in Example 1, except that the process of [3] Main polymerization in Example 1 is changed as follows.

[3] Main Polymerization

[0167]A fully equipped, 5-liter autoclave was purged with hydrogen molecule, and into the autoclave, 1500 g of propylene was charged. After the temperature of propylene was elevated to 60° C., 50 ml of n-heptane, 0.41 mmol of triethylaluminum, 0.078 mmol of diethylaminotriethoxysilane, 0.0032 mmol of dicyclopentyldimethoxysilane, and 10 mg of the prepolymerized catalyst which had been prepared in the step of [2] Preparation of prepolymerized catalyst in Example 1 as a solid catalyst component were mixed therewith, and the mixture was injected to the autoclave with hydrogen molecule. The temperature of the autoclave was adjusted to 70° C., and during the polymerization, the pressure was maintained at 3.8 MPa / G with hydrogen molecule. The polymerization was carried out for 1 hour. After completion of t...

example 3

[0169]The polymerization was carried out in the same manner as in Example 1, except that the step of [2] Preparation of prepolymerized catalyst in Example 1 is changed as follows.

[2] Preparation of Prepolymerized Catalyst

[0170]Into a 1-liter autoclave which had been purged with nitrogen gas, 180 ml of n-heptane was charged, cooled to 0° C., and then into the autoclave, 9.0 mmol of triethylaluminum (TEA), 0.09 mmol of dicyclopentyldimethoxysilane, 9.95 g of propylene, and 0.9 mmol, in terms of titanium atoms, of the solid titanium catalyst component [A] which had been prepared in the step of [1] Preparation of solid catalyst component of Example 1 were charged. Then, the autoclave was tightly closed to perform the reaction at 20° C. for 1 hour under stirring. After completion of the polymerization, the reaction mixture was taken out under nitrogen gas atmosphere, and the liquid fraction was removed by decantation. The resultant fraction was three times washed with decane, and thus ob...

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Abstract

Disclosed is a catalyst for olefin polymerization, comprising: Component [A]: a prepolymer obtained by olefin prepolymerization on solid titanium catalyst component having an average particle size of 25 to 70 μm produced by contacting of a solid component (i) having an average particle size of 26 to 75 μm, containing magnesium, titanium, halogen, and an electron donor (c3), and being free from detachment of titanium by washing with hexane at 25° C., a polar compound (ii) having a dipole moment of 0.50 to 4.00 Debye, and at least one compound (iii) selected from liquid titanium (d) and an electron donor (e), in which the content of titanium in the solid component (i) is reduced by ≧25% by weight, and the weight ratio of the sum of the electron donor (c3) and the electron donor (e) to titanium [electron donor (c3+e) / titanium atoms] is ≧7;Component [B]: an organometallic compound; andComponent [C]: an organosilicon compound represented by the following formula (I):Si(OR1)3(NR2R3)   (I)(wherein R1 is a hydrocarbon group having 1 to 8 carbon atoms, R2 is a hydrocarbon group having 1 to 12 carbon atoms or hydrogen atom, R3 is a hydrocarbon group having 1 to 12 carbon atoms).According to the catalyst, an olefin polymer having high stereoregularity and low molecular weight (high fluidity) can be efficiently provided.

Description

TECHNICAL FIELD[0001]The present invention relates to a catalyst for olefin polymerization, to method for polymerizing an olefin using the catalyst for olefin polymerization, and to an olefinic polymer obtained by the polymerization method.BACKGROUND ART[0002]Catalysts comprising a titanium catalyst component and an organoaluminum compound have been commonly known hitherto as those for producing polyolefins. In particular, catalysts using a carrier-supported solid titanium catalyst component as the titanium catalyst component are known to exhibit a high polymerization activity. Above all, the catalysts using a titanium catalyst component supported on magnesium chloride as the solid titanium catalyst component are known to exhibit a high polymerization activity, and to produce polyolefins having high stereoregularity when olefins such as propylene and butene are polymerized. Further, as a catalyst for producing a polyolefin having higher stereoregularity, there has been proposed, for...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08F4/18C08F4/16
CPCC08F10/00C08F110/06C08F210/16C08F4/6492C08F4/6545C08F4/651C08F4/6495C08F2500/12C08F2500/15C08F2500/24C08F210/06
Inventor HIGUCHI, MASASHIMATSUMURA, SHUJISASAKI, YOSHIOMORITA, KIYOMIHASHIZUME, SATOSHI
Owner MITSUI CHEM INC
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